#define _CRT_SECURE_NO_WARNINGS 1
class Solution {
public:
    vector<int> sortArray(vector<int>& nums) {
        srand(time(NULL));
        qsort(nums, 0, nums.size() - 1);
        return nums;
    }

    void qsort(vector<int>& nums, int l, int r)
    {
        if (l >= r) return;

        int key = GetRandM(nums, l, r);
        int i = l, left = l - 1, right = r + 1;
        while (i < right)
        {
            if (nums[i] < key) swap(nums[++left], nums[i++]);
            else if (nums[i] == key) i++;
            else swap(nums[--right], nums[i]);
        }
        //[l,left][left+1,right-1][right,r]
        qsort(nums, l, left);
        qsort(nums, right, r);
    }

    int GetRandM(vector<int>& nums, int left, int right)
    {
        int r = rand();
        return nums[r % (right - left + 1) + left];
    }
};